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openmpi/config/ompi_get_libtool_linker_flags.m4

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dnl -*- shell-script -*-
dnl
dnl Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
dnl University Research and Technology
dnl Corporation. All rights reserved.
dnl Copyright (c) 2004-2005 The University of Tennessee and The University
dnl of Tennessee Research Foundation. All rights
dnl reserved.
dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
dnl University of Stuttgart. All rights reserved.
dnl Copyright (c) 2004-2005 The Regents of the University of California.
dnl All rights reserved.
dnl $COPYRIGHT$
dnl
dnl Additional copyrights may follow
dnl
dnl $HEADER$
dnl
AC_DEFUN([OMPI_CHECK_LINKER_FLAGS],[
#
# libtool has been created by this point
# Try to see if it will add any additional flags for dependant libraries
#
AC_MSG_CHECKING([for libtool-supplied linker flags])
libtool="$1"
extra_flags="$2"
# Get the directory where libtool lives
start="`pwd`"
d="`dirname $libtool`"
cd "$d"
libtool="`pwd`/libtool"
cd "$start"
unset d start
# Make a playground to work in
mkdir conftest.$$
cd conftest.$$
cat > foo.c <<EOF
int foo(void) { return 0; }
EOF
ompi_check_linker_flags_work() {
OPAL_LOG_MSG([$cmd], [yes])
eval $cmd >&5 2>&5
if test -n "[$]1"; then
output=`eval $cmd 2>/dev/null | head -n 1 | sed -e 's,^libtool: *,,' -e 's,^link: *,,'`
fi
status="$?"
OPAL_LOG_MSG([\$? = $status], [yes])
if test "$status" != "0"; then
AC_MSG_RESULT([libtool error!])
AC_MSG_ERROR([Cannot continue])
fi
}
#
# First make a sample library with the current LDFLAGS and LIBS
#
cmd="$libtool --mode=compile --tag=CC $CC $CFLAGS -c -o foo.o foo.c"
ompi_check_linker_flags_work
cmd="$libtool --mode=link --tag=CC $CC $CFLAGS foo.lo $LDFLAGS $LIBS -o libfoo.la"
ompi_check_linker_flags_work
#
# Now fake linking to it and capture the output from libtool
#
cmd="$libtool --dry-run --mode=link --tag=CC $CC bar.lo libfoo.la -o bar $extra_flags"
ompi_check_linker_flags_work yes
# eat any extra whitespace in CC, as libtool will do the same
tmpCC=`echo $CC | sed -e 's/\//\\\\\//g'`
output=`echo $output | sed -e "s/^$tmpCC//"`
eval "set $output"
extra_ldflags=
while test -n "[$]1"; do
case "[$]1" in
*.libs/bar*) ;;
bar*) ;;
-I*) ;;
-L*) ;;
-R*) ;;
-lfoo) ;;
*.libs/libfoo.*) ;;
-o) ;;
*.so) ;;
*.a) ;;
*)
extra_ldflags="$extra_ldflags [$]1"
;;
esac
shift
done
if test -n "$extra_ldflags"; then
AC_MSG_RESULT([$extra_ldflags])
else
AC_MSG_RESULT([no extra flags])
fi
cd ..
rm -rf conftest.$$])dnl